﻿using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Xml;
using System.Xml.Serialization;

namespace SysCommon
{
    ///XML序列化和反序列化 封装类
    public static class XmlHelper
    {
        /// <summary>
        /// 反序列化
        /// </summary>
        /// <param name="type">类型</param>
        /// <param name="xml">XML字符串</param>
        /// <returns></returns>
        public static object Deserialize(Type type, string xml)
        {
            try
            {
                using (StringReader sr = new StringReader(xml))
                {
                    XmlSerializer xmldes = new XmlSerializer(type);
                    return xmldes.Deserialize(sr);
                }
            }
            catch (Exception e)
            {

                return null;
            }
        }

        /// <summary>
        /// 反序列化
        /// </summary>
        /// <param name="type"></param>
        /// <param name="xml"></param>
        /// <returns></returns>
        public static object Deserialize(Type type, Stream stream)
        {
            XmlSerializer xmldes = new XmlSerializer(type);
            return xmldes.Deserialize(stream);
        }

        /// <summary>
        /// 序列化
        /// </summary>
        /// <param name="type">类型</param>
        /// <param name="obj">对象</param>
        /// <returns></returns>
        public static string Serializer(Type type, object obj)
        {
            MemoryStream Stream = new MemoryStream();
            XmlSerializer xml = new XmlSerializer(type);
            try
            {
                //序列化对象
                xml.Serialize(Stream, obj);
            }
            catch (InvalidOperationException)
            {
                throw;
            }
            Stream.Position = 0;
            StreamReader sr = new StreamReader(Stream);
            string str = sr.ReadToEnd();

            sr.Dispose();
            Stream.Dispose();

            return str;
        }

        //序列化Xml
        public static string ObjectToXmlSerializer(Object Obj, bool IsNamespaces=true)
        {
            
            string XmlString = "";
            XmlWriterSettings settings = new XmlWriterSettings();
            //去除xml声明
            settings.OmitXmlDeclaration = !IsNamespaces;
            settings.Indent = true;
            settings.Encoding = Encoding.Default;
            using (System.IO.MemoryStream mem = new MemoryStream())
            {
                using (XmlWriter writer = XmlWriter.Create(mem, settings))
                {

                    //去除默认命名空间xmlns:xsd和xmlns:xsi
                    XmlSerializerNamespaces ns = new XmlSerializerNamespaces();
                    if (IsNamespaces)
                    {
                        ns.Add("", "http://www.w3.org/2001/XMLSchema-instance");
                        ns.Add("noNamespaceSchemaLocation", "amzn-envelope.xsd");
                    }
                    else
                    {
                        ns.Add("", "");
                    } 
                    XmlSerializer formatter = new XmlSerializer(Obj.GetType());
                    formatter.Serialize(writer, Obj, ns);
                }
                XmlString = Encoding.Default.GetString(mem.ToArray());
            }
            return XmlString;
        } 

        //反序列化
        public static T ObjectToXmlDESerializer<T>(string str)where T : class
        {
            object obj;
            using (System.IO.MemoryStream mem = new MemoryStream(Encoding.Default.GetBytes(str)))
            {
                using (XmlReader reader = XmlReader.Create(mem))
                {
                    XmlSerializer formatter = new XmlSerializer(typeof(T));
                    obj = formatter.Deserialize(reader);
                }
            }
            return obj as T;
        }

        private static void XmlSerializeInternal(Stream stream, object o, Encoding encoding)
        {
            if (o == null)
                throw new ArgumentNullException("o");
            if (encoding == null)
                throw new ArgumentNullException("encoding");
            XmlSerializer serializer = new XmlSerializer(o.GetType());
            XmlWriterSettings settings = new XmlWriterSettings();
            settings.Indent = true;
            settings.NewLineChars = "\r\n";
            settings.Encoding = encoding;
            settings.IndentChars = "    ";
            using (XmlWriter writer = XmlWriter.Create(stream, settings))
            {
                serializer.Serialize(writer, o);
                writer.Close();
            }
        }

        /// <summary>
        /// 将一个对象序列化为XML字符串
        /// </summary>
        /// <param name="o">要序列化的对象</param>
        /// <param name="encoding">编码方式</param>
        /// <returns>序列化产生的XML字符串</returns>
        public static string XmlSerialize(object o, Encoding encoding)
        {
            using (MemoryStream stream = new MemoryStream())
            {
                XmlSerializeInternal(stream, o, encoding);
                stream.Position = 0;
                using (StreamReader reader = new StreamReader(stream, encoding))
                {
                    return reader.ReadToEnd();
                }
            }
        }

        /// <summary>
        /// 将一个对象按XML序列化的方式写入到一个文件
        /// </summary>
        /// <param name="o">要序列化的对象</param>
        /// <param name="path">保存文件路径</param>
        /// <param name="encoding">编码方式</param>
        public static void XmlSerializeToFile(object o, string path, Encoding encoding)
        {
            if (string.IsNullOrEmpty(path))
                throw new ArgumentNullException("path");
            using (FileStream file = new FileStream(path, FileMode.Create, FileAccess.Write))
            {
                XmlSerializeInternal(file, o, encoding);
            }
        }

        /// <summary>
        /// 从XML字符串中反序列化对象
        /// </summary>
        /// <typeparam name="T">结果对象类型</typeparam>
        /// <param name="s">包含对象的XML字符串</param>
        /// <param name="encoding">编码方式</param>
        /// <returns>反序列化得到的对象</returns>
        public static T XmlDeserialize<T>(string s, Encoding encoding)
        {
            if (string.IsNullOrEmpty(s))
                throw new ArgumentNullException("s");
            if (encoding == null)
                throw new ArgumentNullException("encoding");
            XmlSerializer mySerializer = new XmlSerializer(typeof(T));
            using (MemoryStream ms = new MemoryStream(encoding.GetBytes(s)))
            {
                using (StreamReader sr = new StreamReader(ms, encoding))
                {
                    return (T)mySerializer.Deserialize(sr);
                }
            }
        }

        /// <summary>
        /// 读入一个文件，并按XML的方式反序列化对象。
        /// </summary>
        /// <typeparam name="T">结果对象类型</typeparam>
        /// <param name="path">文件路径</param>
        /// <param name="encoding">编码方式</param>
        /// <returns>反序列化得到的对象</returns>
        public static T XmlDeserializeFromFile<T>(string path, Encoding encoding)
        {
            if (string.IsNullOrEmpty(path))
                throw new ArgumentNullException("path");
            if (encoding == null)
                throw new ArgumentNullException("encoding");
            string xml = File.ReadAllText(path, encoding);
            return XmlDeserialize<T>(xml, encoding);
        }

    }
}
 
